mesa/src/compiler/glsl/glcpp at 7325f699dbd7e44a07f10937d5d6f54ccbde2ecb - fdo-mirrors/mesa

mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2025-12-26 21:30:09 +01:00

History

Timothy Arceri 3a9edfc494 glsl: isolate object macro replacments Here we use a leading space to isolate them from the code they will be inserted into. For example: #define VALUE -1.0 int a = -VALUE; Should be evaluated to int a = - -1.0; not int a = --1.0; Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/7932 Cc: mesa-stable Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> Reviewed-by: Tapani Pälli <tapani.palli@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21352>		2023-02-20 01:50:05 +00:00
..
tests	glsl/tests: do not perform eol-conversion on windows	2022-08-23 09:16:19 +00:00
glcpp-lex.l	glsl: add preprocessor #include support	2019-11-20 05:05:55 +00:00
glcpp-parse.y	glsl: isolate object macro replacments	2023-02-20 01:50:05 +00:00
glcpp.c	glcpp: Fully initialize struct gl_context	2021-03-19 08:50:37 +00:00
glcpp.h	glsl/glcpp: make sure to expand new token after concatenation	2022-01-04 23:36:42 +00:00
meson.build	meson: use files() instead of joining paths	2023-01-27 11:35:50 +00:00
pp.c	glcpp: Fix undefined behaviour in glcpp	2021-03-25 00:23:43 +00:00
pp_standalone_scaffolding.c	mesa: add support cursor support for relative path shader includes	2019-11-20 05:05:56 +00:00
pp_standalone_scaffolding.h	mesa: add support cursor support for relative path shader includes	2019-11-20 05:05:56 +00:00
README

README

glcpp -- GLSL "C" preprocessor

This is a simple preprocessor designed to provide the preprocessing
needs of the GLSL language. The requirements for this preprocessor are
specified in the GLSL 1.30 specification availble from:

http://www.opengl.org/registry/doc/GLSLangSpec.Full.1.30.10.pdf

This specification is not precise on some semantics, (for example,
#define and #if), defining these merely "as is standard for C++
preprocessors". To fill in these details, I've been using a draft of
the C99 standard as available from:

http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf

Any downstream compiler accepting output from glcpp should be prepared
to encounter and deal with the following preprocessor macros:

	#line
	#pragma
	#extension

All other macros will be handled according to the GLSL specification
and will not appear in the output.

Known limitations
-----------------
A file that ends with a function-like macro name as the last
non-whitespace token will result in a parse error, (where it should be
passed through as is).